Chapter 12 Test Review

Front

What is resonance in chemistry?

Back

Resonance refers to the phenomenon where a molecule can be represented by two or more valid Lewis structures, which contribute to the overall hybrid structure of the molecule.

Front

Which molecule exhibits resonance?

Back

SO3 (sulfur trioxide) exhibits resonance.

Front

How can you determine the number of valence electrons in main group elements?

Back

The number of valence electrons corresponds to the group number for main group elements.

Front

What is the Lewis Dot Structure for ammonia (NH3)?

Back

The Lewis Dot Structure for NH3 shows nitrogen in the center with three hydrogen atoms bonded to it and a lone pair of electrons on nitrogen.

Front

What type of molecule is CCl4?

Back

CCl4 (carbon tetrachloride) is a nonpolar molecule.

Front

What type of bond exists between two chlorine atoms in Cl2?

Back

The bond between two chlorine atoms in Cl2 is a covalent nonpolar bond.

Front

Define a polar molecule.

Back

A polar molecule has a net dipole moment due to the presence of polar bonds, resulting in a molecule with a positive and a negative end.

Front

Define a nonpolar molecule.

Back

A nonpolar molecule has no net dipole moment, meaning the charge distribution is even, and it does not have distinct positive or negative ends.

Front

What is the significance of valence electrons in chemical bonding?

Back

Valence electrons are the outermost electrons of an atom and are involved in forming bonds with other atoms.

Front

What is a covalent bond?

Back

A covalent bond is a chemical bond formed by the sharing of electron pairs between atoms.